A safety support device for deep foundation pits

Abstract

This utility model relates to the field of building support technology, and specifically discloses a deep foundation pit safety support device, including a foundation pit body, a ground surface at the top of the foundation pit body, a pit bottom at the bottom of the foundation pit body, a platform in the middle section of the foundation pit body, a water-stop curtain at the platform, and retaining piles installed at the platform; a water pump is placed in the water-stop curtain, and when groundwater seeps into the water-stop curtain, the water pump pumps out the water in the water-stop curtain, which can continue to prevent groundwater from seeping further in and avoid damaging the foundation pit structure. At the same time, the retaining piles located at the side of the water-stop curtain, together with the traction of anchor cables, can prevent soil displacement. The wire mesh and shotcrete slope protection will wrap the edge of the foundation pit body, which can effectively reduce the surface soil from being washed away by rainwater and prevent the foundation pit from collapsing, thus effectively improving the safety of the foundation pit.

Description

Technical Field

[0001] This utility model relates to the field of building support technology, and in particular to a safety support device for deep foundation pits. Background Technology

[0002] In the field of construction engineering, deep foundation pit construction faces numerous challenges. Ensuring the stability of the surrounding soil and the safety of construction personnel and equipment is of paramount importance. In practical applications, such building support structures typically require the following technologies: 1. Soil reinforcement technology: The soil around the foundation pit is reinforced by methods such as soil nailing walls and anchor bolts. Soil nailing walls form a composite structure with the soil and soil nails working together by setting dense soil nails in the soil, thereby improving the shear strength and stability of the soil.

[0003] 2. Retaining structure technology: Structures such as piles and underground continuous walls are used to block the lateral displacement of the soil. Pile groups are generally composed of reinforced concrete piles or steel piles, arranged at certain intervals, which can effectively withstand the lateral pressure of the soil and prevent the soil from sliding into the foundation pit.

[0004] 3. Waterproofing structure technology: In order to prevent groundwater from seeping into the foundation pit and affecting construction safety and quality, an effective waterproofing structure must be set up to form a water-proof layer and prevent groundwater from seeping in.

[0005] When carrying out construction, if you encounter an area with abundant groundwater resources, a large amount of groundwater will increase the possibility of foundation pit leakage, reduce the shear strength of the soil, and increase the risk of foundation pit slope instability. Once leakage occurs, it will not only affect the construction environment inside the foundation pit, causing earthwork excavation, foundation construction and other operations to be unable to proceed normally, but may also cause the surrounding ground to settle, causing damage to nearby buildings and underground pipelines. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a deep foundation pit safety support device. It solves the technical problem that during construction, if the area has abundant groundwater resources, a large amount of groundwater will increase the possibility of foundation pit leakage, reduce the shear strength of the soil, and increase the risk of foundation pit slope instability. Once leakage occurs, it will not only affect the construction environment inside the foundation pit, causing earthwork excavation, foundation construction and other operations to be unable to proceed normally, but may also cause surrounding ground subsidence, damaging nearby buildings and underground pipelines.

[0007] To achieve the above objectives, this utility model provides the following technical solution: A deep foundation pit safety support device includes a foundation pit body, a ground surface at the top of the foundation pit body, a pit bottom at the bottom of the foundation pit body, a platform in the middle section of the foundation pit body, a water-stop curtain at the platform, and retaining piles installed at the platform.

[0008] Preferably, the retaining piles are located at the side ends of the water-stop curtain.

[0009] Preferred option: The bottom of the pit is filled with cohesive soil for backfilling.

[0010] Preferred option: The slope of the main body of the foundation pit is protected by a wire mesh and shotcrete.

[0011] Preferably, anchor cables are embedded in the soil layer at the side end of the foundation pit.

[0012] Preferably, the end of the anchor cable is fixedly connected to the retaining pile.

[0013] Compared with the prior art, the present invention has the following beneficial effects: By placing water pumps inside the water-stop curtain, when groundwater seeps into the curtain, the pumps will extract the water, thus preventing further infiltration and damage to the foundation pit structure. Simultaneously, the retaining piles located on the sides of the water-stop curtain, combined with anchor cables, prevent soil displacement. The wire mesh and shotcrete slope protection will wrap around the edges of the foundation pit, effectively reducing the risk of surface soil erosion and collapse, thus significantly improving the safety of the foundation pit. Attached Figure Description

[0014] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0015] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 This is a structural diagram of the wire mesh shotcrete slope protection of this utility model; Figure 3 This is a structural diagram of the water-stop curtain of this utility model; Figure 4 This is a structural diagram of the anchor cable of this utility model.

[0016] Legend: 1. Main body of the foundation pit; 2. Ground surface; 3. Bottom of the pit; 4. Platform; 5. Water-stop curtain; 6. Retaining piles; 7. Cohesive soil backfill; 8. Shotcrete slope protection with wire mesh; 9. Anchor cable. Detailed Implementation

[0017] This application provides a deep foundation pit safety support device that effectively solves the technical problem that, during construction in areas with abundant groundwater resources, large amounts of groundwater increase the possibility of foundation pit leakage, reduce the shear strength of the soil, and increase the risk of foundation pit slope instability. Once leakage occurs, it not only affects the construction environment within the foundation pit, causing earthwork excavation and foundation construction to be unable to proceed normally, but may also cause surrounding ground subsidence, damaging adjacent buildings and underground pipelines. By placing a water pump in the water-stop curtain, when groundwater seeps into the water-stop curtain, the water pump will pump out the water in the water-stop curtain, which can continue to prevent groundwater from seeping further inward and avoid damaging the foundation pit structure. At the same time, the retaining piles located at the side of the water-stop curtain, together with the traction of the anchor cables, can prevent soil displacement. The wire mesh and shotcrete slope protection will wrap the edge of the foundation pit body, which can effectively reduce the surface soil from being washed away by rainwater and prevent the foundation pit from collapsing, thus effectively improving the safety of the foundation pit. Example

[0018] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the technical solution in this application embodiment effectively solves the problem that during construction, if an area with abundant groundwater resources is encountered, a large amount of groundwater will increase the possibility of foundation pit leakage, reduce the shear strength of the soil, and increase the risk of foundation pit slope instability. Once leakage occurs, it will not only affect the construction environment inside the foundation pit, causing earthwork excavation, foundation construction and other operations to be unable to proceed normally, but may also cause surrounding ground subsidence, damaging adjacent buildings and underground pipelines. The overall idea is as follows: In view of the problems existing in the prior art, the present invention provides a deep foundation pit safety support device, including a foundation pit body 1, a ground surface 2 at the top of the foundation pit body 1, and a pit bottom 3 at the bottom of the foundation pit body 1.

[0019] Platform 4 is set in the middle section of the main body 1 of the foundation pit. A water-stop curtain 5 is set at platform 4. Retaining piles 6 are installed at platform 4 and are located at the side end of the water-stop curtain 5.

[0020] The bottom of the pit 3 is filled with cohesive soil backfill 7, and the slope of the main body of the pit 1 is equipped with a wire mesh sprayed concrete slope protection 8. Anchor cables 9 are buried in the soil layer at the side end of the main body of the pit 1, and the ends of the anchor cables 9 are fixedly connected to the retaining piles 6.

[0021] The main body of the foundation pit 1: The entire building support system is built around it and is the core object of deep foundation pit construction. Its slope is designed to be about 45 degrees to facilitate the transportation of excavated soil, and at the same time, it provides space and foundation for the installation of other support components such as water-stop curtain 5, retaining piles 6, wire mesh sprayed concrete slope protection 8 and anchor cables 9. Surface 2: Marks the top boundary of the main body of the foundation pit 1. Together with the main body of the foundation pit 1, it constitutes a description of the spatial scope of the construction site. It is the connection between the entire construction area and the external ground, and also the starting reference surface for the commencement of construction activities. Pit bottom 3: This is the end point of the excavation depth of the foundation pit. After the excavation is completed, cohesive soil is filled on it for backfilling 7, which plays a certain role in reinforcing and protecting the bottom of the pit. Platform 4 serves as the installation location for the water-stop curtain 5 and retaining piles 6, providing a platform for these two important support structures to effectively perform their functions of water-stopping and soil retention. At the same time, the setting of platform 4 facilitates operation and equipment parking during the construction process. Water-stop curtain 5: Its main function is to prevent groundwater from seeping inward and protect the foundation pit structure from damage by groundwater. When groundwater seeps in, the water pump placed inside can pump the water out, further enhancing the water-stopping effect and maintaining a dry construction environment inside the foundation pit. Retaining piles 6: In conjunction with anchor cables 9, they jointly bear the lateral pressure of the soil layer, prevent the soil layer from shifting, and provide support and protection for the sidewalls of the main body of the foundation pit 1, ensuring the stability of the foundation pit slope. 7. Backfilling with cohesive soil: Utilize the properties of cohesive soil to enhance the sealing and stability of the pit bottom and prevent problems such as leakage at the pit bottom; 8. Mesh-lined shotcrete slope protection: Wrapping and protecting the edge of the foundation pit reduces the risk of surface soil being washed away by rainwater and causing it to slide down, prevents the foundation pit from collapsing due to soil loss on the slope, and enhances the stability and safety of the foundation pit slope. Anchor cable 9: After being fixed in the soil duct by grouting, anchor cable 9 can provide strong tensile force, work together with retaining pile 6 to pull and fix the soil layer, prevent the soil layer from shifting, and improve the overall stability of the foundation pit.

[0022] Working principle: The first step involves creating an angle between the ground surface 2 and the pit bottom 3 during the excavation of the main body 1. This angle facilitates the removal of the excavated soil. A platform 4 is then constructed in the middle section of the main body 1. Multiple ducts are drilled in the soil layer at the side of the main body 1, and anchor cables 9 are installed in these ducts and secured with grout. A water-stop curtain 5 is then constructed downwards on the platform 4. Retaining piles 6 are installed at the side of the water-stop curtain 5 using a grouting method. Simultaneously, the portion of the anchor cables 9 reserved for this purpose is poured into the piles. After the main body 1 is excavated, cohesive soil 7 is backfilled onto the pit bottom 3.

[0023] The second step involves placing a water pump within the water-stop curtain 5. When groundwater seeps into the water-stop curtain 5, the water pump will extract the water from the water-stop curtain 5, thus continuing to prevent groundwater from seeping further in and damaging the foundation pit structure. At the same time, the retaining piles 6 located on the side of the water-stop curtain 5, in conjunction with the traction of the anchor cables 9, can prevent soil displacement. The wire mesh and shotcrete slope protection 8 will wrap the edge of the foundation pit body 1, effectively reducing the surface soil from being washed away by rainwater and preventing the foundation pit from collapsing, thus effectively improving the safety of the foundation pit.

[0024] Finally, it should be noted that the above embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the implementation. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A safety support device for deep foundation pit, comprising a foundation pit main body (1), characterized in that, The top of the foundation pit body (1) is provided with a ground surface (2), the bottom of the foundation pit body (1) is provided with a pit bottom (3), the middle section of the foundation pit body (1) is provided with a platform (4), a water-stop curtain (5) is provided at the platform (4), and retaining piles (6) are installed at the platform (4).

2. The safety support device for deep foundation pit according to claim 1, characterized in that, The retaining piles (6) are located at the side end of the water-stop curtain (5).

3. The safety support device for deep foundation pit according to claim 1, characterized in that, The bottom of the pit (3) is filled with cohesive soil backfill (7).

4. The safety support device for deep foundation pit according to claim 1, characterized in that, The slope of the main body of the foundation pit (1) is equipped with a wire mesh sprayed concrete slope protection (8).

5. The safety support device for deep foundation pit according to claim 1, characterized in that, Anchor cables (9) are buried in the soil layer at the side end of the main body (1) of the foundation pit.

6. A safety support device for deep foundation pit according to claim 5, wherein, The end of the anchor cable (9) is fixedly connected to the retaining pile (6).

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